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Abstract

Typically, transition edge sensors resolve photon number of up to 10 or 20 photons, depending on the wavelength and TES design. We extend that dynamic range up to 1000 photons, while maintaining sub-shot noise detection process uncertainty of the number of detected photons and beyond that show a monotonic response up to ≈ 6 · 106 photons in a single light pulse. This mode of operation, which heats the sensor far beyond its transition edge into the normal conductive regime, offers a technique for connecting single-photon-counting measurements to radiant-power measurements at picowatt levels. Connecting these two usually incompatible operating regimes in a single detector offers significant potential for directly tying photon counting measurements to conventional cryogenic radiometric standards. In addition, our measurements highlight the advantages of a photon-number state source over a coherent pulse source as a tool for characterizing such a detector.

(a) Simulation of photon-number statistics for different input states. The red bars show the anticipated TES photon number response when illuminating the TES with an NF = 1, 20, and 80 Fock states. The black bars show the TES response when illuminating with a coherent state with N̄ = 1, 20, and 80. (b) Data for a heralded photon state from parametric down-conversion (PDC).